Field Evaluation of Different Insecticides Against Wheat Aphid (Schizaphis graminum Rondani) and Comparative Yield Assessment for Different Wheat Cultivars
Wheat (Triticum aestivum L.) is an important cereal crop and is used as a staple food all over the world. Wheat aphid (Schizaphis graminum R.) is a destructive insect pest of wheat crop. Field trials were carried out to evaluate the efficacy of three synthetic insecticides at their field recommended doses i.e. Pyremetrozine 50 WG @ 200 gm ha-1 , Imidacloprid 20 SL @ 625 ml ha-1 and Lambda-cyhalothrin 2.5 EC @ 625 ml ha-1 against wheat aphid on four wheat cultivars viz; Galaxy 2013, Punjab 2011, Millat 2011 and Sehar 2006. Comparative wheat yield was also determined at the end of experiment which was laid out under Randomized Complete Block Design with a control plot without any insecticide application. All insecticides significantly reduced aphid infestation; however, on numerical basis, Imidacloprid 20 SL appeared to be the most effective with minimum infestation (1.25 aphids per plant) and maximum percentage mortality (97.13%) assessed fourteen days after application. Maximum grain yield (5.58 t ha-1) was recorded for the cultivar Galaxy 2013 in plots treated with Lambda-Cyhalothrin. Nevertheless, highest yield losses were observed for Seher-2006 (9.3%) as compared to control. It can be concluded from the present study that pest resistant cultivars and synthetic insecticides can be integrated to manage the wheat aphid population below economic thresholds.